9, 10-alkoxy-3-alkyl-2, 2-(dithiosubstituted)-benzoquinolizines



United States Patent 3,390,152 9,10-ALKOXY-3-ALKYL-2,2-(DITHIOSUB- STITUTED)-BENZOQUINOLIZINES Michael Raymond Harnden, Waukegan, Ill., assignor to Abbott Laboratories, North Chicago, 111., a corporation of Illinois No Drawing. Filed Oct. 21, 1965, Ser. No. 500,228 Claims. (Cl. 260-286) 3,390,152 Patented June 25, 1968 ice avoidance responses which can be directly correlated with anti-anxiety elfects. In addition, the compounds have low toxicity as supported by tests showing that, for example, the hydrochloride of the compound of the above formula wherein each R is methyl, R is isobutyl and each R" is methyl, has an oral LD of about 1000-mg./kg. and an intraperitoneal LD of about 400 mg./ kg. in mice. Other salts of the above series have similarly low toxicities: in all instances tested, the oral LD in mice were found to be above 400 rug/kg, and frequently above 1000 ABSTRACT OF THE DISCLOSURE mg 3,9,104Yi5ubsfituted Y The process for preparing the new compounds is demonlq in Carrying Sulfur containing functiOIlS in t strated by the following examples which are illustrations Z-position are described. These compounds and their nononly d are t meant to li i th invention i any toxic salts are active tranquilizers and useful in the treatrespect, ment of anxlety' Example 1.2,2-dimethylthio-3-isobutyl-9,lo -dimethoxy- 1,2,3,4,6,7 hexahydro 11b-H-benzo[a.]quinolizine hy- The present invention is directed to new compounds in drochlonde the benzoquinolizine series. In particular it is directed to The amount of 2-oxo-3-isobutyl-9,IO-dimethoxy-l,2,3,4, 3,9,10-trissubstituted 1,2,3,4,6,7 hexahydro-11b-H-benzo 6,7 hexahydro-l1b-H-benz0[a]quinolizine hydrochloride [a]quinolizines carrying two sulfur containing functions in obtained from 3 g. of the free base, is dissolved in 100 the 2-position and having the general formula ml. of ethanol saturated with hydrochloric acid gas. To this solution, 10 ml. of methane thiol is added and the solution is allowed to stand at room temperature for 18 hrs. before being evaporated under reduced pressure. The solid residue is treated with 20 ml. of water, filtered and dried to yield 2.7 g. of 2,2-dimethylthio-3-isobuty1-9,10'- dimethoxy-1,2,3,4,6-,7 hexahydro-l1b-H-benzo[a]-quinolizine hydrochloride (66.1% of theory) melting at 220-6 C. The pure compound, obtained by recrystallization from methanol/ ether melts at 226-7 C.

When replacing 2-oxo-3-isobutyl-9,10-dimethoxy-1,2,3, wherein each R is a saturated alkyl group of l-7 car 4,6,7 hexahydro 11b H-benzo[a]quin0lizine hydron atoms, of both R groups together y be a ylene chloride with the corresponding 9,10-methylenedioxy p, R is a branched r linear loweralkyl of analogue, 2,2-dimethylthio-3-isobuty1-9,10 methylenedibon atoms or a N,N- il w r alkyl r g p, and oxy-1,2,3,4,6,7 hexahydro-llb H-benzo[a]quinolizine each R" is a saturat d 01' unsaturat lowemlkyl group, hydrochloride is obtained in a similar yield. When the a hydroxyloweralkyl group. a carb lk xyl l yl starting material carries heptoxy-groups in the 9- and 10- gro p or n yl g p, and the acid addition salts f 40 positions, the same procedure results in 2,2-dimethylthiothese organic bases. 3-isobutyl-9,IO-diheptoxy 1,2,3,4,6,7 hexahydro-llb-I-L The compounds of this invention are made from anlzlrlol-1 b n o[ i li i hydrochloride, ous 3,9,l0-substituted-Z-ketobenzo[a]quino izines, w ic z u'e described in British Patent 789,789. The new com- Examples 2-9 pounds and particularly their non-toxic acid addition salts The following table shows a variety of products made are active as tranquilizers and are particularly useful in according to the method described in Example 1 with the treatment of anxiety. They can be administered by the obvious changes in the starting materials used. In this the oral, intraperitoneal, intramuscular or intravenous table, the column headed by each A refers to the subroute to warm-blooded animals. When administered instituent R of the generic formula shown above. The traperitoneally to rats at a dose of mg./kg. the com- 50 terms Me and lit used in this table refer to methyl and pounds show outstanding activity in blocking conditioned ethyl respectively.

R(0) 11(10) 1t EachA M.P., 0 Yield,

percent 2 Me -Me -CI-I2GHMe -Et 219-21 9s a -Me -Me -cH.oHMe2 -(cH, 3Me 171-73 78 4 -Me Me CH OHMez -CH2CH=CII2 14345 74 5 --Me -Me CH CI'IMez 216-18 46 -Me -CH2CHM82 -CH2OH2OH 217-19 30 -Me CHzCHMe2 -OHzOCOEt 218-20 42 Me -CONEt2 Me 197-200 at] Me -CONEtz -Et 177-79 86 It will be obvious to those skilled in the art that other alkyl groups may replace those indicated above for the 3-, 9 and l0-positions, e.g., saturated loweralkyl groups of 1-7 carbon atoms may be attached to the oxygen functions at the 9- and 10-positions and branched or linear alkyl groups may be attached to the ring in the 3- position.

While the above table refers to the melting points of hydrochloric acid salts, it will be apparent that other acid addition salts can be made in a similar fashion. Of these the non-toxic salts such as the sulfuric, phosphoric, acetic and tartaric acids, are of more significant importance since they can be directly used as tranquilizers or anti-anxiety drugs. However, other salts are equally use ful in that they can serve as intermediates for the preparation of non-toxic salts. The non-toxic acid addition salts are thus the preferred embodiments of the present invention, particularly since they are better soluble in the useful pharmaceutical vehicles. The free bases are only sparingly soluble in water but exhibit good solubility in various organic solvents such as alcohols. The acid addition salts are also more stable than the free bases which are unstable in alkaline solutions.

Others may practice the invention in any of the numerous ways which will be suggested to one skilled in the art by the present disclosure. All such practice of the invention is considered to be a part hereof provided it falls within the scope of the appended claims.

wherein each R is a loweralkyl group or wherein both R groups together are the methylene group, R is a branched or linear loweralkyl group and each R is an unsaturated lowcralkyl, saturated loweralkyl, hydroxyloweralkyl, carbalkoxyloweralkyl, or phenyl, and pharmaceutically-acceptable acid addition salts thereof.

2. The compounds of claim 1 wherein each R is methyl, R is isobutyl and each R" is loweralkyl.

3. The compound of claim 2 wherein each R" is methyl.

4. The compounds of claim 1 wherein both R groups together are the methylene group, R is isobutyl and each R" is methyl.

5. Acid addition salts of the compounds of claim 1 wherein said acid is hydrochloric acid.

References Cited UNITED STATES PATENTS 9/1963 Tretten 260-286 

